Coil-winding machine



W. L. OBRIEN AND 0. H. SPENCER. COIL WINDING MACHINE.

APPLICATION FILED DECJI. 1919.

1 ,406,21 5, Patented Feb. 14, 1922.

3 SHEETS-SHEET l- W L. OBRIEN AND O. H. SPENCER.

coIL WINDING MACHINE.

APPLICATION FILED DEC.H, I919- I Patented Feb. 14, 1922.

3 SHEETS-SHEET 2.

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[ZZZ/95555 a W. L. OBRIEN AND 0. H. SPENCER.

COIL WINDING MACHINE.

APPLICATION FILED 020. ll. 1919.

Patented Feb. 14, 1922.

3 SHEETS-SHEET 3- v I I I m ETD STATES PATENT OFFICE.

WILLIAM L. OBRIEN AND OWEN HI. SPENCER, OF DAYTON, OHIO, ASSIGNORS TO THE DAYTON ENGINEERING LABORATORIES COMPANY, A CORPORATION OF OHIO.

COIL-WINDING. MACHINE.

Specification of Letters Patent.

Patented Feb. 14, 1922.

Application filed December 11, 1919. Serial No. 344,121.

To all whom it may concern:

Be it known that we, WILLIAM L. OBRIEN and @WEN H. SPENCER, citizens of the United States of America, residing at Dayton, county of Montgomery, State of Ohio, have invented certain new and useful Improvements in Coil-Winding Machines, of which the following is a full, clear, and exact description. r

This invention relates to improvements in the manufacturing of coils of wire for electrical apparatus, and particularly for the field magnets of dynamos and motors.

One of the objects of the present invention is to construct and build a coil that the space required for a coil of given capacity will be reduced to a minimum.

The usual manner of building up coils is to start winding the coil from the interior thereof toward the exterior. This method results in one end of the coil being at the interior thereof while the other is at the exterior, necessitating the bringing out of the interior end of the coil alongside the coil or the addition of an auxiliary lead alongside the coil to make external connections, thereby requiring additional space for the coil. However, in the present invention the necessity of this additional space is obviated, and the object of the present invention referred to, is carried out b arranging the different layers of the coil in such a manner, that the coil when wound will have both its extremities terminating in the outside layers.

Where the present invention is applied to the manufacture of coils having a plurality of transversely disposed flat layers, the method of construction consists of forming one layer by starting from the outside and winding toward the inside so that consecutive turns of each layer are located nearer to the axis of the coil than the preceding turns, and then forming the next layer by winding the consecutive turns from the inside toward the outside of the coil, so that the consecutive turns are located at increasing distances from the axis of the coil.

Another object of the invention is to provide a machine by which the foregoingmethod may be efficiently carried out.

Other and furtherobjects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein preferred embodiments of the present invention are clearlyshown.

. hollowed out body portion 21.

ing the position of the elements when the coil ,is completely wound.

Fig. 5 is .a view of a portion of the spindle removed from the machine, and including the collapsible guide element.

Fig. 6 is a perspective view of the coil when completely wound and removed from the machine.

Fig. 7 is an end view of the shifting nut removed from the spindle.

Referring to the drawings the winding machine, comprises a base 20, having a horizontal body portion 21. This body portion 21 is hollowed out as at 22, and is adapted to act as a journal box for the bearing 23.

Supported by the bearing 23, is a spindle 24, one extremity of which projects into the This extremity of the spindle 24 is provided with screw threads 25 adapted to carry the spindle shifting nut 26. This nut has associated therewith a locking screw 38 which is adapted to prevent the rotation of the nut while permitting same to have relative longitudinal movement. The opposite extremity of the spindle 24, represented by the numeral 27, may be of any suitable conformation to produce a coil of any desired shape. In the present form of construction the portion 27 of the spindle 24 is of a rectangular shape (see Fig. 1) and produces a rectangular shaped coil as illustrated in Fig. 6. A lug 28 is provided on the end face of the spindle 24 for purposes hereinafter described. On each of the two shortest sides of the spindle portion 2? there is formed a channel 29 of predetermined lengtlr for a purpose to be explained.

A guide abutment block 30 is apertured frectangularl to correspond with the coned by the attendant.

in correct initial position relative to the spindle each time it is slipped on, a yieldable stop device is provided. The guide block 30 is apertured to provide for the reception of two oppositely disposed balls 31 adapted to slide in the channels 29, formed in spindle 24. These balls 31 are held in close engagement with the channels 29 by means of the springs 32 which in turn are held in position by the screws 33. The inside ends of the holes containing the screws 33, springs 32 and balls 31 are slightly restricted thereby permitting a portion of the balls 31 to pro ject therethrough while at the same time preventing them from falling out when the block 30 is removed from the spindle 24. It is intended that the guide block 30 be manually placed upon spindle 24 in correct position for starting the winding of a coil. In performing this operation the attendant shoves the block 30 along spindle 24 until resistance is offered by the balls 31 striking against the inner ends of channels 29. Then no further movement to block 30 is impart- However the yieldable stop device described will permit further relative movement of block 30 and spindle 24 during the operation of the machine.

Adjacentto the outer face of the bear ng 23, the spindle 24 has a cup-shaped portion 34, providing a chamber 35 for receiving a collapsible guide to be described.

Carried by the spindle 24 is a collapsible guide 36, made up of a series of spirally arranged turns of flat resilient metal. The inner end of this collapsible guide 36 is slidably mounted on the spindle 24 while the other or outer end is anchored to the inside face of the cup-shaped portion 34 in any suitable manner. By referring to Fig. 5 the guide element is shown anchored to the cupshaped portion 34 by means of a screw 36".

Also located within the chamber 35 and adjacent to the inside edges of the collapsible guide element 36. are a series of guide collapsing elements 37 which, at a determined time in the operation of the machine will engage with the aforementioned inside edges of the collapsible guide 36 causing the outside edges of said guide element to be brought into alignment for purposes described hereinafter.

Referring to the Figs. 1, 2, 3 and 4. the spindle 24 is shown having a shaft 39 passing therethrough. Secured to the one end of this shaft is a crank arm which may be termed the main operating lever 40. A ball thrust bearing 41 is shown positioned between the operating lever 40 and the body portion 21. The opposite end of the shaft 39 is provided with a cross arm 42 which may be formed integral with or secured to said shaft in any suitable manner. This cross arm 42 is so proportioned in length and breadth that when its longer sides are parallel to the longer sides of the rectangular portion of the spindle, the block 30 may be removed from the spindle while, when said longer sides of the cross arm 42 are positioned at right angles to the longer sides of the rectangular portion of the spindle, the block cannot be removed. Normally, the shaft 39 is not connected with the spindle 24 in any manner, however, as soon as the shaft is rotated a certain number of degrees, the cross arm 42 will engage with the lug 28 causing the spindle 24 and shaft 39 to rotate as one.

For a predetermined number of, revolutions of the crank arm 40, the movement of the spindle 24 is rotational only. During these predetermined revolutions of the spindle. the adjustable shifting nut 26 being prevented from rotating by the locking screw 38. will travelto the right from its position on the spindle adjacent to the bearing 23, (see Fig. 2) to the position shown in Fig. 3. Further revolutions of the crank arm 40 will cause the spindle to travel to the left as viewed in the drawings due to the fact that the nut 26 now abuts against the inner wall of the body portion 21 and any further movement of the nut 26 to the right is prevented.

In order that the cross arm 42 on the shaft 39 does not interfere with the hori- Zontal movement of the spindle 24, a chan nel 43 is provided and so located in said spindle that the cross arm 42 and channel will be in alignment when the cross arm engages with the lug 28 thereby permitting the cross arm 42 to slide into the channel 43.

Referring to the Figs, 1 and 2, a bracket 44 is carried by the spindle 24 and secured thereto by screws 45. Bracket 44 carries an outwardly projecting ledge 46 carrying a threaded stud 48. A removable clamping element 47 is apertured to slide over stud 48. A nut 48 cooperates with stud 48 to clamp ledge 46 and clamp 47 together. The inside faces of the ledge 46 and clamping element 47 are provided with grooves 46 and 47 respectively between which the wire used for making up the coil is clamped. Tightening up nut 48 clamps the wire securely between element 47 and ledge 46.

Formed integral with the body portion 21 is a lug 49 to which is secured a rod 50. A slideable gage 51 is carried by this rod, said gage being adapted to be held in any desired position on this rod by means of a set screw 52. Gage 51 carries an arm 53 projecting opposite the clamping members 46 and 47 when in the "home" position shown in Fig. The setting of arm determines the length of wire extending out beyond the coil when completed. this portion of the coil being used as a terminal.

In winding coils. ithas been found that when a wire or strap material of any substantial thickness is used the inherent resiliency of the wire or strap metal will tend to cause the different layers of said wire or strap metal to buckle away from the form on which they are wound. This might prove detrimental in long coils for electric machines wherein space is a decided factor. In order to overcome this the winding machine of the present invention is provided with a device which will so bend the wire that when said wire is wound upon this form the different layers will have more of a tendency to buckle in toward the form than to buckle out away from the form.

This bending device comprises a plate 56 secured to the base of the machine by means of bolts 57. Another plate 58, which is se cured to plate 56 in any suitable manner, carries wheels 59 mounted on studs 60. A third wheel 61 is mounted upon a stud 62 which projects outwardly from a block 63.

Block 63 is mounted to slide upon plate 58 and is apertured to provide for the passage therethrough of a screw 64 having screw threaded engagement at its lower end with the plate 58. The screw 64 is provided with a collar 65 which cooperates with the head of screw 64 to prevent end-wise movement of the block 68 relative to screw 64. By adjusting the screw 64 the relation of the wheel 61 to the wheel 59 is changed in order to vary the amount of reverse bend placed in the wire' while being formed into a coil by the machine. Tn this manner the proper amount of reverse bend may be placed in the wire so that when the wire is wound upon the spindle there will be no tendency for the wire to spring away from the spindle and unwind itself on being removed from the'spindle.

A cutting gage 71 provided. with aseries of grooves 72 is secured to the base 20 in any suitable manner. The purpose of this gage V the collapsible spiral winding 81 to be fiatwill appear more clearly hereinafter.

The operation of the machine is as follows:

The elements of the machine which have been described are first placed .ifn the position shown in Fig. 2. The clamping element 47 is loosened by loosening the nut 48 upon the stud 48. Then the operator withdraws a portion of wire from a supply spool or reel upon which the wlre is received from the manufacturer. The wire 80 inserted between the rolls 59' and 61, is then brought up over the upper side of the col.- lapsible form 36, is inserted between members 46 and 47 and is then shoved forward until the end of the wire strikes against the arm 53. The wire 80 is then clamped between members'46 and 47 by tightening up the nut 48 upon the stud 48. The operator then grasps the lever 40 and turns the same in a counter clockwise direction as viewed in Fig.

1. The cross arm 42 will engage with the lug 28 and both the shaft39 and the spindle 24 will start to rotate; The continual turning of the lever 40 will cause the wire 80 to be withdrawn from the supply spool and to be wound in a conical spiral fashion upon the collapsible winding form 36. This portion of the wire thus formed is indicated by numeral 81 in Fig. 3. After this conical spiral portion 81 has been formed an additional turn of the crank 40 will cause. an additional turn of wire 82 to be wound about the spindle 24 and about a portion of the innermost turn of the conical spiral portion 81. By this time the nut 26 will have traveled from the position shown in Fig. 2 to the position shown in Fig. 3 wherein its right-hand end butts against the horizontal bearing portion 21 of the frame 20. Further movement to the right of the nut 26 is prevented.

As the lever 40 continues to be turned, additional turns of the wire will be wound upon the turn 82 until a coil of wire of flat s iral formation, indicated by numeral 83 in ig. 4 is formed. While the formation of the portion 83 is taking place the spindle 24 will be moved to the left as viewed in the drawings so that it will finally occupy the position shown in Fig. 4. The block 30 however, will not move to the left as viewed in the drawings, since such movement is prevented by the cross arm 42 carried by the shaft 39. Obviously movement to the left of the shaft 39 is prevented by the thrust bearing 41 which presses against the outer surface of the frame 20. Therefore while the coil portion 83 is being formed, the spindle 24 will move to the left as viewed in the drawings and take the position shown in Fig. 4. During this movement of the spindle 24 the guide collapsing blocks 37 will move into engagement with the collapsible guide 36 and will bring the outer edges of the spiral turns of this guide 36 into alignment, thereby causing tened out or telescoped and to be pressed against the flat spiral portion 83 of the coil. The result is that the coil when completed will take the form shown perspective in Fig.

.6, and shown in section in Fig. 4. It is dur ing this end-wise movement of the spindle 24 that the yieldable stop device provided in the block 30 comes into action. It will be noted that while the block 30 is being held from end-wise movement by the cross arm 42 provided on the end of shaft 89, that the spindle 24 is caused, while being rotated, to project itself through the block 30. It is during this movement that the grooves 29 move away from the balls 31 and cause them to engage surfaces of the spindle 24 which are more removed from the axis of the spindle.

The coil having been completed the next step is to remove the same from the machine. This isaccomplished first by loosening the nut 48- in order to release the ,Wire from the clamp members 46 and 47.

60. "against the flat spiral turns while the lati The handle 40 is then turned in a clockwise must be severed. This canbe done in any' convenient manner as by means ocf a pair of shears. The grooves-72 and the block 71 are for the purpose of determining the proper location of the point of the shears in order that the shear blades may be located properly to cut off the wire at the desired distance from the coil.

Referring to Figs. 2 and 7 the shifting nut 26 is provided with a plurality of grooves 74 Wl'l'lCh are engaged by the locking screw 38. In order to make certain adjustments necessary to take up wear the screw 38 is removed and the nut 26 is turned on the screw threaded end of the spindle 24: to a required distance and so. that one of the grooves 74 may be engaged by the nut 38 when the same is replaced in the machine.

While the forms of mechanisms herein shown and described constitute preferred forms of embodiments of the invention, it is to be understood that other forms might be adopted, all coming claims which follow.

What we claim is as follows:

1. The method of forming a coil having a plurality of transversely disposed flat layers, whichconsists in forming one layer by starting from the outside and winding toward the inside in a conical spiral form so that consecutive turns" of each layer are located nearer to the axis of the coil than the preceding turns and then forming the next layer by winding the consecutive turns from the inside toward the outside of the coil in a fiat spiral form, so that the consecutiveturns are located at increasing distances from the axis of the coil, and collapsing the conical spiral formed turns ter are being wound. I

2. The method of forming plurality of transversely disposed flat lay- (are, which consists in formin one layer by starting from the'outside an winding toward the inside in a conical spiral form so that the consecutive turnspf each layer are next 1a or by winding the consecutive coil, in a flat spiral form, so that the con-' secutive turns are located at increasing dislocated nearer to the axisof the coil than the preceding turns and then forming the ,urns e inside toward the outside of the tances from the axis of the coil, and col within the scope of the bination with a manna 1y 0 V shaped guide, a coil having 57 lapsing each of the conical spiral formed turns successively against the correspondin}; flat spiral turns while the latter are being wound.

3. In a coil winding machine, the combination with a winding spindle; of a guide adapted to have a portion of said coil wound thereon in a conical spiral form; a guide for causing the other portion of said coil to be wound in a fiat spiral form; and means for collapsing the spirally wound coil portion I against the flat portion.

4. In a coil winding machine, the combination with a manually operated winding spindle; of a guide adapted to have a portion of said coil wound thereon in a conical spiral form;,a guide for causing the other portion of said coil to be wound in a flat spiral form; and means for collapsing the spirally wound coil portion against the flat portion.

5. In a coil winding machine, the combination with a manually operated spindle; of a spirally shaped, collapsible guide adapted to have a ortion of said coil wound thereon; a guide or causing the other portion of said coil to be wound in a flat spiral form; and means for collapsing the spirally shaped guide, whereby the windings thereon will be telescoped and pressed against the flat spirally shaped windings.

6. In a coil winding machine, the combination with a manually operated spindle; of a spirally shaped collapsible guide adapted to have a portion of said coil wound' thereon; a guide for causing the other portion of said coil to be wound in a flat spiral form; and means associated with the manually operated spindle for collapsing the spirally shaped guide, whereby the windings thereon will be telescoped and pressed "against the flat' spirally shaped windings.

7. In a coil windin machine, the comrated spindle; of a spirally shaped colla si le guide adapt.- ed to have a portion 0 said coil wound thereon, from the outer edge to the inner edge; a guide for causing the other portion of the c011 to be wound in a flat spiral form; and means amciated with the manually o erated spindle for collapsing the s irall y wherelby the windings t ereqn will be telescoped and pressed against the flat spirally shaped windings.

8. na coil windin machine, the combination with a spi'nd e ada ted to be rotated and move in a longitudinal direction; of a spirally shaped collapsible guide adapted to have thereon, from the outer ed edge; a ide for causing did other portion of the 0011 to be wound in a fiat spiral form; and means associated with the manually o erated spindle'for collapsing the spirally s aped guide, whereby the windings thereon to the inner a portion of said coil wound will be telescoped and pressed against the fiat spirally shaped windings.

9. In a coil winding machine, the combination with a spindle having a threaded portion and adapted "to be rotatively and longitudinally operated; of a spirally shaped, collapsible guide adapted to have a part of the coil wound thereon, from the bination with a spindle having a threaded outer edge to the inner edge; a guide for causing the other portion of the coil to be wound in a fiat spiral form; and a nut, associated with the spindle for collapsing same whereby the windings thereon will be telescoped and pressed against the fiat, spirally shaped windings.

10. In a coil, winding machine, the combination with a spindle having a threaded portion and adapted to be rotatively and longitudinally operated; of a spirally formed resi ient winding form adapted to have a part of the coil wound thereon; a guide for causing the other part of said coil to stack up in a flat spiral form; and a nut associated with said spindle and adapted to cause the spindle to move in a longitudinal direction after a certain part of the coil is wound, whereby the resilient winding form will be collapsed, causing the windings thereon to be telescoped and pressed against the flat spiral windings.

11. In a coil'winding machine, the comportion and adapted to be rotatively and longitudinally operated; of aspira-lly formed resilient winding form adapted to have a part-of said coil to stack up in spiral form; a nut adjustably associated with said spindle and adapted to cause the spindle to move in a longitudinal direction aftersaid spindle has-been operated to wind a certain part of the coil upon the resilient winding form, whereby said form will be collapsed, causing the windings thereon to be telescoped and pressed against the flat spiral windings.

12. In a coil winding machine, the combination with a spindle capableof being operated in a rotative and longitudinal directionhaving winding forms associated therewith; of an adjustable nut carried by the spindle and adapted to transmit a longitudinal movement to the spindle after it has been rotated a" certain number of times; and a cammin spindle an adapted to collapse one of the winding forms to cause the windings thereon to be telescoped and pressed against the windings on the other form,

13. In a coil winding machine, the combination with a spindle adapted to rotatively and longitudinally operate a resilient spiral winding form upon which the first part of the coil may be wound in a spiral manner; a second form adapted to cause the other part of the coil to stack up in a fiat spiral winding; an adjustable nut associated with said element associated with the spindle and adapted for causing'the spindle to move in a longitudinal direction after the winding form whereby the windings upon' said form will be telescoped and pressed against the fiat spiral windings.

14. In a coil winding machine, the combination with a spindle adapted to be rota-tively and longitudinally operated by a resilient spiral windin form for causing the first part of the coil to be wound in a spiral manner; a second form adapted to cause the other part of the coil to stack up in a flat spiral winding; an adjustable nut associated with said spindle and adapted for causing the spindle to move in a longitudinal direction after the spirally wound portion of the coil has been completed; and a camming element supported by the spindle and adapted to move consecutive spiral turns of the resilient winding form in a horizontal or longitudinal direction whereby the windings on said form will be telescoped and forced against the windings on the flat spiral form in consequential order.

15. In a coil winding machine, the combination with a winding spindle; of a conical, spiral, collapsible guide rotatable with said spindle and adapted to have one portion of the coil wound thereon; a guide abutment block also rotatable with the winding spindle and adapted to cause each successive turn of the coil to be wound upon the preceding turn in flat spiral form; and means for moving one of said guides toward the other thereby to collapse the conical spiral guide whereby to telescope the convolutions of the coil material thereon and to press the same against the flat spiral convolutions.

16. In a coil winding machine, the combination with a winding spindle; of a conical, spiral, collapsible guide rotatable with said spindle andadapted tohave one portion of the coil wound thereon; a guide abutment block also rotatable with the winding spindle and adapted to cause each successive turn of the other portion of the coil to be wound upon the preceding turn in flat spiral form;

and means associated with the spindle for moving one of said uides toward the other, thereby to collapse t e conical, spiral guide, whereby to telescope the convolutions of the coil material thereon to press same against flat spiral convolutions.

17. In a coil winding machine, the combination with a windin spindle; of a conical,

spiral, colla sible guide rotatable with said spindlean adapted to have one portion of the coil wound thereon; a guide abut ment block also rotatable with the winding spindle and adapted to cause each successive turn of the other portion of the coil to be wound upon the preceding turn in fiat spiral form; and means brought into effect by the rotation of the spindle for moving one of said guides toward the other, thereby to collapse the conical, spiral guide, whereby to telescope the convolutions of the coil material thereon to press same against the flat spiral convolutions.

18. In a coil winding machine, the combination with a winding spindle; of a conical, spiral, collapsible guide rotatable with said spindle and adapted to have one portion of the coil wound thereon; a guide abutment block also rotatable with the winding spindle and adapted to cause each successive turn of the other portion of the coil to be wound upon the preceding turn in flat spiral form; and means brought into effect by the rotation of the spimdle, to move said spindle in a lateral direction for moving the' conical spiral guide toward the guide abutment block, thereby to collapse the said conical spiral guide, whereby to telescope the convolutions of coil material thereon to press same against the flat spiral convolutions.

19. In a coil Winding machine, the combi nation with a winding spindle; of a conical, spiral, collapsible guide rotatable with said, spindle and adapted to have one portion of the coil wound thereon; a guide abutment block also rotatable with the winding spindle and adapted to cause each successive turn of the other portion of the coil to be wound upon the preceding turn in fiat spiral form; and means brought into efiect during the winding of the fiat spiral turns to move the spindle in a lateral direction toward the abutment block and causing the collapsing of the conicalspiral guide, thereby to telescope the turns of coil material thereon and to press them against the flat spiral turns. 7 20. In a coil winding machine, the combination with a winding spindle; of a conical,

spiral, collapsible guide having one end secured to the spindle and adapted to rotate therewith; a guide abutment block carried by the spindle in close proximity to the inner convolution of the conical spiral guide; means for maintaining this relative distance between the inner convolution of the conical spiral guide and the abutment guide block; and means brought into elfect by the rotation of the spindle to cause said spindle to move longitudinally in the irection of and through the abutment guide block, thereby to telescope and collapse the conical spiral guide unt1l it has assumed a flat spiral form or purposes set forth. 21. In a coil winding machine, the combination with awinding spindle; of a conical, spiral, collapsible guide having one end secured to the spind e and adapted to rotate therewith and to have a portion of the coil or material wound thereon; a guide abutment block carried by the spindle in close proximity to the inner convolution of the conical spiral guide and adapted to cause each successive convolution of the other portion of coil material to be wound upon the preceding convolution in a flat spiral term; means for maintaining this relative distance between the inner convolution of the conical spiral guide and the abutment guide block; and means brought into effect by the rotation of the spindle during the winding of the coil material on the conical spiral guide, to cause said spindle to move longitudinally in the direction of and through the abutment guide block, thereby to telescope and collapse the conical spiral guide until it has assumed a flat spiral form for pushing said convolutions oif the spiral guide into a flat spiral form against the other flat spiral coil portion for purposes set forth.

22. In a. coil winding machine, the combination with a winding spindle; of a conical.

spiral, collapsible guide rotatable with said spindle and adapted to have one portion of the coil wound thereon; a guide abutment block also rotatable with the winding spindle and adapted to cause each successive turn of the coil to be wound upon the preceding turn in fiat spiral form; means for moving one of said guides toward the other thereby to collapse the conical spiral guide whereby to telescope the convolutions of the coil material thereon and to press the same against the fiat spiral convolutions; and clamping means carried by and rotatable with the spindle for gripping the coil material to hold same in position during the winding operation.

23. In a coil winding machine, the combination with a winding spindle; of a conical, spiral, collapsible guide rotatable with said spindle and adapted to have one portion of the coil wound thereon; a guide abutment block also rotatable with the winding spindle and adapted to cause each successive turn of the coil to be wound upon the preceding turn in fiat spiral form; means for moving one of said guides toward the other thereby to collapse the conical spiral guide whereby to telescope the convolutions of the coil material thereon and to press thesame gainst the fiat spiral convolutions; clamping means carried by and rotatable with the spindle for gripping the coil material to hold same in position during the winding operation; and an adjustable gauge secured to the machine anddirectly in the path of the coil material when gripped in the clamping means for maintaining a predetermined length of material at this end of all the coils produced on this machine.

24. Ina coil winding machine, the combination with a winding spindle; of a collapsible winding form adapted to rotate with said spindle and adapted to have coil forming material wound thereon from the second winding form adapted to have said coil forming'material wound from the inside toward the outside thereon; means for rotating said winding forms; and means for telescoping the collapsible winding form.

26. In acoil windingmachine, the combination with a winding spindle. provided with a collapsible winding form adapted to have the coil forming material wound thereon from the, outside toward its axis and a second winding form adapted, to have said coil forming material wound from the inside toward the outside thereon; means for rotating said winding forms; and means for telescoping the collapsible winding form) while the coil forming material is being wound on the second winding form.

27. In a coil winding machine provided with a cylindrical body portion and a base for supporting same, the combination with a winding spindle supported by a bearing in the body portion and capable of rotative and longitudinal movement relative to said bearin and screw threaded at the inner extremlty; a drive shaft concentrically proshifting nut to rotate with the spindle;

means associated with the s indle for connecting the drive shaft an spindle after the drive shaft has been rotated a prede-- termined distance; a conical, spiral, collapsible guide carried by said spindle having one end of said guide anchored thereto while the other end is free; a camming element carried by the spindle and adapted to telescope the conical, spiral guide after the spindle has been rotated a certain number, of times and has been moved longitudinally for a predetermined distance; and an abutment guide block capable of being slipped on the outer end of the spindle when the drive shaft is in its normal inoperative position but locked in position on the spindle after the drive shaft has been rotated to operatively connect said shaft with the spindle.

. 28. In a coil winding machine including a base supporting a cylindrically shaped hollow body portion; the combination with a winding splndle supported by said hollow body portion; a drive shaft provided with a crank and a cross arm, said cross arm being adapted to engage with a lug on the spindle after said shaft has been rotated for a certain portion of a revolution thereby causing the spindle to be rotated with the drive shaft; a conical, s iral, collapsible winding form carried by t e spindle; a removable abutme'nt guide block carried by the spindle adjacent to the spiral winding form but locked in position by the engagement of the shaft cross arm with the spindle lug; a camming element 'secured to the spindle and adapted to engage with the spiral winding form to telescope same; and an adjustable shifting element associated with'the spindle and causing said spindle to move longitudinally to telescope the conical spiral guide after said spindle has been rotated for a certain number of revolutions.

-In testimony whereof we aflix our signatures.

WILLIAM L.- OBRIEN. I OWEN SPENCER. .Witnesses:

WALTER W. RIEDEL,

HAZEL SOLLENBERGER. 

